Mazda 3 Service Manual: Climate Control Unit Inspection [Full Auto Air Conditioner]
1. Remove the climate control unit with the connector connected..
2. Switch the ignition to ON.
3. Connect the negative (-) lead of the tester to body ground.
4. By inserting the positive (+) lead of the tester into each climate control unit terminal, measure the voltage according to the terminal voltage table.
-
If there is any malfunction, inspect the parts under Inspection item (s).
-
If the parts under Inspection item (s) are found to be normal (except for terminal 1M), replace the climate control unit.
-
For terminal 1M, first try replacing the power MOS FET. If there is still any malfunction, replace the climate control unit.
Terminal Voltage Table (Reference)
|
Terminal |
Signal name |
Connected to |
Measurement condition |
Voltage (V) |
Inspection item (s) |
|
1A |
|
|
|
|
|
|
1B |
|
|
|
|
|
|
1C |
+5V |
|
Switch the ignition to ON |
5 |
|
|
Switch the ignition to Off |
1.0 or less |
||||
|
1D |
GND |
Body ground |
Under any condition |
1.0 or less |
|
|
1E |
Sensor GND |
|
Under any condition |
1.0 or less |
|
|
1F |
Solar radiation sensor (RH) input |
Solar radiation sensor |
Sunlight shined directly on the solar radiation sensor |
4 |
|
|
Blocking light to solar radiation sensor |
1.0 or less |
||||
|
1G |
Potentiometer input |
Driver-side air mix actuator |
Set temperature at MAX HOT |
4.3 or more |
|
|
Set temperature at MAX COLD |
1.0 or less |
||||
|
1H |
Solar radiation sensor (LH) input |
Solar radiation sensor |
Sunlight shined directly on the solar radiation sensor |
4 |
|
|
Blocking light to solar radiation sensor |
1.0 or less |
||||
|
1I |
Potentiometer input |
Passenger-side air mix actuator |
Set temperature at MAX COLD |
1.0 or less |
|
|
Set temperature at MAX HOT |
4.3 or more |
||||
|
1J |
|
|
|
|
|
|
1K |
Potentiometer input |
Airflow mode actuator |
VENT |
4.3 or more |
|
|
BI-LEVEL |
3.4 |
||||
|
HEAT |
2.5 |
||||
|
HEAT/DEF |
1.6 |
||||
|
DEFROSTER |
0.7 or less |
||||
|
1L |
Evaporator temperature sensor input |
Evaporator temperature sensor |
Compared with temperature detected by evaporator temperature sensor |
Refer to graph 1 |
|
|
1M |
Blower fan speed control |
Power MOS FET |
Fan stopped |
1.0 or less |
|
|
Fan: manual 1st |
2.2 |
||||
|
Fan: manual 7th |
9.7 |
||||
|
1N |
Blower motor feedback |
|
Fan stopped |
B+ |
|
|
Fan: manual 1st |
9.8 |
||||
|
Fan: manual 7th |
0.4 or less |
||||
|
1O |
|
|
|
|
|
|
1P |
|
|
|
|
|
|
1Q |
Motor operation (COLD) |
Passenger-side air mix actuator |
Moving towards HOT |
1.0 or less |
|
|
Moving towards COLD |
B+ |
||||
|
1R |
Motor operation (FRESH) |
Air intake actuator |
Moving towards RECIRCULATE |
1.0 or less |
|
|
Moving towards FRESH |
B+ |
||||
|
1S |
Motor operation (HOT) |
Passenger-side air mix actuator |
Moving towards HOT |
B+ |
|
|
Moving towards COLD |
1.0 or less |
||||
|
1T |
Motor operation (RECIRCULATE) |
Air intake actuator |
Moving towards RECIRCULATE |
B+ |
|
|
Moving towards FRESH |
1.0 or less |
||||
|
1U |
Motor operation (COLD) |
Driver-side air mix actuator |
Moving towards HOT |
1.0 or less |
|
|
Moving towards COLD |
B+ |
||||
|
1V |
Motor operation (DEFROSTER) |
Airflow mode actuator |
Moving towards DEFROSTER |
B+ |
|
|
Moving towards VENT |
1.0 or less |
||||
|
1W |
Motor operation (HOT) |
Driver-side air mix actuator |
Moving towards HOT |
B+ |
|
|
Moving towards COLD |
1.0 or less |
||||
|
1X |
Motor operation (VENT) |
Airflow mode actuator |
Moving towards VENT |
B+ |
|
|
Moving towards DEFROSTER |
1.0 or less |
||||
|
2A |
Illumination control |
Instrument cluster |
Headlight switch ON and panel light control switch at MAX |
1.0 or less |
|
|
Headlight switch ON and panel light control switch at MIN |
11.5 |
||||
|
2B |
B+ |
ROOM 15 A fuse |
Under any condition |
B+ |
|
|
2C |
|
|
|
|
|
|
2D |
|
|
|
|
|
|
2E |
MS_CAN_H |
CAN related module |
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
|
2F |
TNS signal |
TNS relay |
TNS ON |
B+ |
|
|
TNS OFF |
1.0 or less |
||||
|
2G |
MS_CAN_L |
CAN related module |
Because this terminal is for communication, good/no good judgment by terminal voltage is not possible. |
|
|
|
2H |
IG2 |
HEATER 10 A fuse |
Switch the ignition to ON |
B+ |
|
|
Switch the ignition to Off |
1.0 or less |
||||
|
2I |
|
|
|
|
|
|
2J*1 |
Refrigerant pressure sensor input |
Refrigerant pressure sensor |
Compared with temperature detected by refrigerant pressure sensor |
(See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) |
|
|
2K |
|
|
|
|
|
|
2L |
|
|
|
|
|
|
2M |
Passenger compartment temperature sensor input |
Passenger compartment temperature sensor |
Compared with temperature detected by passenger compartment temperature sensor |
Refer to graph 2 |
|
|
2N |
Passenger compartment temperature sensor GND |
Passenger compartment temperature sensor |
Under any condition |
1.0 or less |
|
|
2O |
|
|
|
|
|
|
2P |
|
|
|
|
|
*1 MZR 2.3 DISI Turbo, MZR 2.5
|
|
|
Climate Control Unit Disassembly/Assembly [Manual Air Conditioner]
1. Disassemble in the order indicated in the figure.
1
Dial
2
Airflow mode wire
(See Wire Removal Note.)
(See Wire Installation Note.)
...
Climate Control Unit Inspection [Manual Air Conditioner]
1. Remove the climate control unit with the connector connected..
2. Switch the ignition to ON.
3. Connect the negative (-) lead of the tester to the body ground.
4. By inserting the positive (+ ...
Other materials:
Restraints SST [Two Step Deployment Control System]
49 H066 002
Deployment tool
49 D066 002
Adapter harness
49 L066 002
Adapter harness
49 G066 003
Adapter harness
49 N088 0A0
Fuel and Therm ...
Vehicle Speed Sensor (VSS) Inspection [FS5 A EL]
On-Vehicle Inspection
1. Inspect the power supply circuit for the VSS.
a. Remove the insulator from the transaxle.
b. Disconnect the VSS connector.
c. Switch the ignition to ON (engine off).
d. Measure the voltage at VSS connector terminal A (harness-side).
If there is a ...
Auto Leveling Sensor Inspection
1. Disconnect the negative battery cable..
2. Remove the auto leveling sensor..
3. Connect the three dry cell batteries (1.5 V) in a series.
4. Connect auto leveling sensor terminal A to the batterys minus terminal, and
terminal C to the batterys plus terminal, and apply 4.5 V of volta ...
